Digital Deception

If a picture is worth a thousand words, a "photoshopped" image would likely yield many more -- all of them negative -- if the intention is to mislead the public.

Adobe's Photoshop, which traces its roots back almost 25 years to a program called Display, has been the newsroom standard in image-editing software. The latest edition of the company's Creative Suite, which includes Photoshop, was unveiled this week.

Most of the time, the software is used to make minor adjustments, such as to lighten or sharpen an image. But on some occasions, photo editing has gone too far. Missiles have been added, government officials have been erased, and heads have been transplanted onto bodies.

Here are some of the most infamous news photos to have been manipulated by image-editing software.